fix: task exception was never retrieved in transcribe

[nquang29]

#2175

[nquang29]

help me to review @beastoin
during testing, i found that func send_last_conversation can throw this error, so i fixed it as well:

Task exception was never retrieved future: <Task finished name='Task-8' coro=<_listen.<locals>.send_last_conversation() done,

[beastoin]

1/ any feasible solutions without try-catch ?

@nquang29

[nquang29]

1/ another way is use await sir @beastoin

[beastoin]

1/ wait wait, why asyncio.create_task was the issue but await is not ? you know we didn;t want users to wait for finish the sending initial file(for speaker indentificating) before using our speech to text service.

@nquang29

[nquang29]

1/ >asyncio.create_task was the issue but await is not : Task exception was never retrieved appear when exception is raised in task but task never awaited or inspects on it

i created an util func to create task safely if exist exception @beastoin